What is one of the primary ways that dust and soil can become contaminated with lead?

One of the primary ways that dust and soil can become contaminated with lead is through weathering and chipped paint. In older buildings, lead-based paints were commonly used, and over time, these paints can deteriorate, peel, or chip, releasing lead particles into the surrounding environment. When this happens, the lead can settle in dust and soil, creating a significant risk for lead exposure, especially for children who may ingest lead dust through hand-to-mouth activities or through contaminated soil.

The process of deteriorating paint contributes to the accumulation of lead in areas where people, particularly vulnerable populations such as children, spend time playing and exploring. As these particles break down and become airborne or are disturbed, they can settle in nearby dust and soil, heightening the potential for lead poisoning and health issues associated with lead exposure.

Other options like plant growth, water runoff, and natural erosion are not typical pathways for lead contamination in the same direct manner as weathering and chipped paint. While water runoff can carry contaminants, the direct link of deteriorating painted surfaces to lead contamination in dust and soil makes this choice the most relevant in the context of lead exposure risks.